Synthesis of 4, 5-benzotropones by cyclization of 1, 3-bis-silyl enol ethers with 1, 2-dialdehydes

…, TH Van Nguyen, P Langer

Index: Albrecht, Uwe; Van Nguyen, Thi Hong; Langer, Peter Journal of Organic Chemistry, 2004 , vol. 69, # 10 p. 3417 - 3424

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Citation Number: 16

Abstract

The cyclization of 1, 3-bis-silyl enol ethers or (2, 4-dioxobutylidene) triphenylphosphoranes with phthalic dialdehyde allowed a convenient synthesis of a variety of 4, 5-benzotropones. The hydrogenation of benzotropones afforded functionalized benzocycloheptanones which were transformed into tricyclic butenolides.